/**
*    Copyright (C) 2008 10gen Inc.
*
*    This program is free software: you can redistribute it and/or  modify
*    it under the terms of the GNU Affero General Public License, version 3,
*    as published by the Free Software Foundation.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU Affero General Public License for more details.
*
*    You should have received a copy of the GNU Affero General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*    As a special exception, the copyright holders give permission to link the
*    code of portions of this program with the OpenSSL library under certain
*    conditions as described in each individual source file and distribute
*    linked combinations including the program with the OpenSSL library. You
*    must comply with the GNU Affero General Public License in all respects for
*    all of the code used other than as permitted herein. If you modify file(s)
*    with this exception, you may extend this exception to your version of the
*    file(s), but you are not obligated to do so. If you do not wish to do so,
*    delete this exception statement from your version. If you delete this
*    exception statement from all source files in the program, then also delete
*    it in the license file.
*/

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommands

#include "mongo/pch.h"

#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/bson/util/builder.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/cloner.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/copydb.h"
#include "mongo/db/commands/rename_collection.h"
#include "mongo/db/db.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/instance.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/isself.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/storage_options.h"
#include "mongo/util/log.h"

namespace mongo {

    class CmdCloneCollection : public Command {
    public:
        CmdCloneCollection() : Command("cloneCollection") { }

        virtual bool slaveOk() const {
            return false;
        }

        virtual bool isWriteCommandForConfigServer() const {
            return false;
        }

        virtual std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const {
            return parseNsFullyQualified(dbname, cmdObj);
        }

        virtual Status checkAuthForCommand(ClientBasic* client,
                                           const std::string& dbname,
                                           const BSONObj& cmdObj) {
            std::string ns = parseNs(dbname, cmdObj);

            ActionSet actions;
            actions.addAction(ActionType::insert);
            actions.addAction(ActionType::createIndex); // SERVER-11418

            if (!client->getAuthorizationSession()->isAuthorizedForActionsOnResource(
                    ResourcePattern::forExactNamespace(NamespaceString(ns)), actions)) {
                return Status(ErrorCodes::Unauthorized, "Unauthorized");
            }
            return Status::OK();
        }

        virtual void help( stringstream &help ) const {
            help << "{ cloneCollection: <collection>, from: <host> [,query: <query_filter>] [,copyIndexes:<bool>] }"
                 "\nCopies a collection from one server to another. Do not use on a single server as the destination "
                 "is placed at the same db.collection (namespace) as the source.\n"
                 ;
        }

        virtual bool run(OperationContext* txn,
                         const string& dbname,
                         BSONObj& cmdObj,
                         int,
                         string& errmsg,
                         BSONObjBuilder& result,
                         bool fromRepl) {

            string fromhost = cmdObj.getStringField("from");
            if ( fromhost.empty() ) {
                errmsg = "missing 'from' parameter";
                return false;
            }

            {
                HostAndPort h(fromhost);
                if (repl::isSelf(h)) {
                    errmsg = "can't cloneCollection from self";
                    return false;
                }
            }

            string collection = parseNs(dbname, cmdObj);
            if ( collection.empty() ) {
                errmsg = "bad 'cloneCollection' value";
                return false;
            }
            BSONObj query = cmdObj.getObjectField("query");
            if ( query.isEmpty() )
                query = BSONObj();

            BSONElement copyIndexesSpec = cmdObj.getField("copyindexes");
            bool copyIndexes = copyIndexesSpec.isBoolean() ? copyIndexesSpec.boolean() : true;

            log() << "cloneCollection.  db:" << dbname << " collection:" << collection << " from: " << fromhost
                  << " query: " << query << " " << ( copyIndexes ? "" : ", not copying indexes" ) << endl;

            Cloner cloner;
            auto_ptr<DBClientConnection> myconn;
            myconn.reset( new DBClientConnection() );
            if ( ! myconn->connect( HostAndPort(fromhost) , errmsg ) )
                return false;

            cloner.setConnection( myconn.release() );

            return cloner.copyCollection(txn, collection, query, errmsg, true, false, copyIndexes);
        }

    } cmdCloneCollection;

} // namespace mongo
